A hearable is a new class of device classified as a head-worn device
that can be used for listening to music but also has additional
functionality provided by sensors. These sensors include heart rate
sensors, accelerometers, gyroscopes, magnetometers, barometers, EEG
sensors, and more. Today most hearables market volume is taken by sports
headphones with heart rate sensors and/or accelerometers for activity
tracking. The fastest growing segment, however, is that of fully
wireless solutions such as Bragi Dash.

The hearables market is growing rapidly, not only in volume terms but
also in the number of new products coming to market. Some recent key
products include Bragi Dash, Doppler Labs Hear One, Samsung Iconix, and
Vi Fitness Coach. The hearables market was estimated to be worth $130
million in 2015, growing rapidly at a CAGR of >120% to be worth $7.6
billion in 2020.

As the hearables market grows it is expected to take share from the
wireless headphone and hearing aid markets as some functionality of both
these types of devices are expected to merge into hearables. That said,
each of these markets will continue to be very significant and see
overall growth.